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slightly hacky but more functional infinite scrolling

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This commit is contained in:
Matthew Hodgson 2014-08-16 00:14:47 +01:00
parent 9f7c5f161c
commit 4068339770
1 changed files with 36 additions and 30 deletions
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66
webclient/room/room-controller.js
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@ -15,36 +15,11 @@ limitations under the License.
*/
angular.module('RoomController', [])
// FIXME move directives outta here!
.directive("keepScroll", function() {
return {
controller : function($scope) {
var element = 0;
this.setElement = function(el){
element = el;
}
this.addItem = function(item){
element.scrollTop = (element.scrollTop + item.clientHeight);
};
},
link : function(scope, el, attr, ctrl) {
ctrl.setElement(el[0]);
}
};
})
// FIXME move directives outta here!
.directive("scrollItem", function(){
return {
require : "^keepScroll",
link : function(scope, el, att, scrCtrl){
scrCtrl.addItem(el[0]);
}
}
})
.controller('RoomController', ['$scope', '$http', '$timeout', '$routeParams', '$location', 'matrixService', 'eventStreamService', 'eventHandlerService',
function($scope, $http, $timeout, $routeParams, $location, matrixService, eventStreamService, eventHandlerService) {
'use strict';
var MESSAGES_PER_PAGINATION = 10;
var MESSAGES_PER_PAGINATION = 30;
$scope.room_id = $routeParams.room_id;
$scope.room_alias = matrixService.getRoomIdToAliasMapping($scope.room_id);
$scope.state = {
@ -52,6 +27,7 @@ angular.module('RoomController', [])
events_from: "END", // when to start the event stream from.
earliest_token: "END", // stores how far back we've paginated.
can_paginate: true, // this is toggled off when we run out of items
paginating: false, // used to avoid concurrent pagination requests pulling in dup contents
stream_failure: undefined // the response when the stream fails
};
$scope.members = {};
@ -61,7 +37,7 @@ angular.module('RoomController', [])
var scrollToBottom = function() {
$timeout(function() {
var objDiv = document.getElementsByClassName("messageTableWrapper")[0];
var objDiv = document.getElementById("messageTableWrapper");
objDiv.scrollTop = objDiv.scrollHeight;
},0);
};
@ -82,18 +58,33 @@ angular.module('RoomController', [])
$scope.paginateMore = function() {
if ($scope.state.can_paginate) {
console.log("Paginating more.");
// console.log("Paginating more.");
paginate(MESSAGES_PER_PAGINATION, false);
}
};
var paginate = function(numItems, toBottom) {
// console.log("paginate " + numItems + ", " + toBottom);
if ($scope.state.paginating) {
return;
}
else {
$scope.state.paginating = true;
}
// console.log("paginateBackMessages from " + $scope.state.earliest_token + " for " + numItems);
var originalTopRow = $("#messageTable>tbody>tr:first")[0];
matrixService.paginateBackMessages($scope.room_id, $scope.state.earliest_token, numItems).then(
function(response) {
// hacky bodge to ensure we always scroll to the bottom on the first pagination
if (!$scope.events.rooms[$scope.room_id]) {
toBottom = true;
}
eventHandlerService.handleEvents(response.data.chunk, false);
$scope.state.earliest_token = response.data.end;
if (response.data.chunk.length < MESSAGES_PER_PAGINATION) {
// no more messages to paginate :(
// no more messages to paginate. this currently never gets turned true again, as we never
// expire paginated contents in the current implementation.
$scope.state.can_paginate = false;
}
@ -101,9 +92,24 @@ angular.module('RoomController', [])
console.log("Scrolling to bottom");
scrollToBottom();
}
else {
$timeout(function() {
// FIXME: this risks a flicker before the scrollTop is actually updated, but we have to
// dispatch it into a function in order to first update the layout. The right solution
// might be to implement it as a directive, more like
// http://stackoverflow.com/questions/23736647/how-to-retain-scroll-position-of-ng-repeat-in-angularjs
// however, this specific solution breaks because it measures the rows height before
// the contents are interpolated.
var objDiv = document.getElementById("messageTableWrapper");
objDiv.scrollTop = originalTopRow ? (originalTopRow.offsetTop + objDiv.scrollTop) : 0;
}, 0);
}
$scope.state.paginating = false;
},
function(error) {
console.log("Failed to paginateBackMessages: " + JSON.stringify(error));
$scope.state.paginating = false;
}
)
};